Sound recording device, sound recording method, storage medium and product

Abstract

The invention provides sound recording equipment, a sound recording method, a storage medium and a product. The sound recording equipment comprises a controller, a first microphone module and a first sound recording acquisition module, the first recording acquisition module comprises at least two gain channels with different gain values; the first microphone module collects an audio signal and transmits the audio signal to each gain channel for analog gain; the first recording acquisition module performs analog-to-digital conversion on the analog gain signals output by the gain channels to obtain digital signals corresponding to the gain channels, and transmits the digital signals corresponding to the gain channels to the controller; and the controller determines a target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, takes the digital signal corresponding to the target gain channel as a recording signal corresponding to the audio signal, and stores the recording signal. According to the scheme, appropriate gains are selected according to the audio signals with different intensities, so that the recording quality during wide dynamic range recording is improved.

Description

Technical Field

[0001] The present application relates to the field of audio processing technology, and in particular to a recording device, a recording method, a storage medium and a product. Background Art

[0002] With the rapid development of the times, smart recording equipment is one of the products in demand in modern workplaces and schools. At present, most recording devices on the market use multi-channel ADC chips to form an 8-channel acquisition system, and 8 microphones to form a microphone array, achieving 8-microphone noise reduction and supporting long-distance sound pickup (not less than 10 meters). However, based on the smart recording function, some professional users also have the need for professional scene recording. For example, for wide dynamic range recording, there are reliability requirements for far-field recording signals and near-field recording signals. Existing recording equipment cannot meet the recording quality requirements for wide dynamic range recording in professional scenes. Summary of the invention

[0003] Based on the above needs, the present application proposes a recording device, a recording method, a storage medium and a product, which can improve the recording quality during wide dynamic range recording.

[0004] To achieve the above objectives, this application proposes the following technical solutions:

[0005] According to a first aspect of an embodiment of the present application, a recording device is provided, comprising: a controller, a first microphone module and a first recording acquisition module; the first recording acquisition module comprises at least two gain channels with different gain values;

[0006] The first microphone module is used to collect audio signals, and transmit the audio signals to the respective gain channels in the first recording collection module for analog gain;

[0007] The first recording acquisition module is used to perform analog-to-digital conversion on the analog gain signals output by each of the gain channels to obtain digital signals corresponding to each of the gain channels, and transmit the digital signals corresponding to each of the gain channels to the controller;

[0008] The controller is used to determine the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, use the digital signal corresponding to the target gain channel as the recording signal corresponding to the audio signal, and store the recording signal.

[0009] Optionally, the controller uses the digital signal corresponding to the target gain channel as a recording signal corresponding to the audio signal, including:

[0010] According to the difference between the gain value of the target gain channel and the maximum gain value, digital gain is performed on the digital signal corresponding to the target gain channel to obtain a digital gain signal;

[0011] Using the digital gain signal as a recording signal corresponding to the audio signal;

[0012] The maximum gain value is the maximum value among the gain values ​​of all gain channels in the first recording acquisition module.

[0013] Optionally, the first recording acquisition module includes: a first gain channel and a second gain channel, and the gain value of the first gain channel is smaller than the gain value of the second gain channel;

[0014] The controller determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, including:

[0015] If the signal strength of the digital signal corresponding to the second gain channel is lower than the preset signal strength, determining that the target gain channel corresponding to the audio signal is the second gain channel;

[0016] If the signal strength of the digital signal corresponding to the second gain channel is not lower than the preset signal strength, it is determined that the target gain channel corresponding to the audio signal is the first gain channel.

[0017] Optionally, the first microphone module includes two microphones; the first recording acquisition module includes a first gain channel corresponding to each microphone and a second gain channel corresponding to each microphone.

[0018] Optionally, the recording device further includes: a second microphone module, an analog switch module and a second recording acquisition module;

[0019] The controller is connected to the analog switch module, and is used to control the connection and disconnection between the analog switch module and the first recording acquisition module, and the connection and disconnection between the analog switch module and the second recording acquisition module according to the user's recording selection;

[0020] The first microphone module is connected to the first recording acquisition module and the second recording acquisition module respectively through the analog switch module, and is used for transmitting the audio signal collected by the first microphone module to the first recording acquisition module through the analog switch module when the analog switch module is connected to the first recording acquisition module, and transmitting the audio signal collected by the first microphone module to the second recording acquisition module through the analog switch module when the analog switch module is connected to the second recording acquisition module;

[0021] The second microphone module is connected to the second recording acquisition module and is used to transmit the audio signal collected by the second microphone module to the second recording acquisition module;

[0022] The second recording acquisition module is connected to the controller and is used for performing analog-to-digital conversion on the received audio signal and transmitting the converted digital signal to the controller so that the controller determines the recording signal according to the digital signal.

[0023] Optionally, the first microphone module includes a first microphone and a second microphone, and the analog switch module includes a first audio switch and a second audio switch;

[0024] The first microphone is connected to the first recording acquisition module and the second recording acquisition module respectively through the first audio switch;

[0025] The second microphone is connected to the first recording acquisition module and the second recording acquisition module respectively through the second audio switch.

[0026] Optionally, the second microphone module includes a first microphone group and a second microphone group, and the second recording acquisition module includes: a first audio analog-to-digital converter and a second audio analog-to-digital converter;

[0027] The first audio switch and the first microphone group are respectively connected to the first audio analog-to-digital converter;

[0028] The second audio switch, the second microphone group and the first audio analog-to-digital converter are respectively connected to the second audio analog-to-digital converter;

[0029] The second audio analog-to-digital converter is connected to the controller.

[0030] Optionally, the first microphone module is a microphone module set according to the direction of the sound source to be collected, and the second microphone module is an omnidirectional microphone module.

[0031] According to a second aspect of an embodiment of the present application, a recording method is provided, which is applied to the above-mentioned recording device, and the recording method includes:

[0032] The first microphone module collects audio signals, and transmits the audio signals to the respective gain channels in the first recording acquisition module for analog gain;

[0033] The first recording acquisition module performs analog-to-digital conversion on the analog gain signals output by each of the gain channels to obtain digital signals corresponding to each of the gain channels, and transmits the digital signals corresponding to each of the gain channels to the controller;

[0034] The controller determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, uses the digital signal corresponding to the target gain channel as the recording signal corresponding to the audio signal, and stores the recording signal.

[0035] According to a third aspect of an embodiment of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned recording method is implemented.

[0036] According to a fourth aspect of an embodiment of the present application, a computer program product is provided, comprising computer program instructions, which, when executed by a processor, enable the processor to implement the above-mentioned recording method.

[0037] The recording device proposed in the present application includes: a controller, a first microphone module and a first recording acquisition module; the first recording acquisition module includes at least two gain channels with different gain values; the first microphone module is used to collect audio signals, and transmit the audio signals to the respective gain channels in the first recording acquisition module for analog gain; the first recording acquisition module is used to perform analog-to-digital conversion on the analog gain signals output by the respective gain channels to obtain digital signals corresponding to the respective gain channels, and transmit the digital signals corresponding to the respective gain channels to the controller; the controller is used to determine the target gain channel corresponding to the audio signal according to the signal strength of the digital signals corresponding to the respective gain channels, use the digital signals corresponding to the target gain channel as the recording signals corresponding to the audio signal, and store the recording signals. By adopting the technical solution of the present application, the data corresponding to the target gain channel can be selected according to the signal strength of the digital signals after analog gain and analog-to-digital conversion of the audio signal with different gain values, so as to select the appropriate gain for audio signals of different intensities, thereby improving the recording quality during wide dynamic range recording. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0039] Figure 1 A structural diagram of a recording device provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of another recording device provided in an embodiment of the present application;

[0041] Figure 3A schematic diagram of the structure of another recording device provided in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of the structure of another recording device provided in an embodiment of the present application;

[0043] Figure 5 A flowchart of a recording method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solution of the embodiment of the present application is applicable to the application scenario of audio processing, and is specifically used in the application scenario of audio processing during recording. The technical solution of the embodiment of the present application can improve the recording quality during wide dynamic range recording.

[0045] With the rapid development of the times, smart recording equipment is one of the products in demand in modern workplaces and schools, such as smart voice recorders. There are many smart voice recorders on the market with various functions to meet different needs. At present, in the recording equipment industry, more and more intelligent functions are supported, such as long-distance sound pickup, sound source positioning, voice recognition, voice-to-text, one-click drafting and other functions. Most recording devices on the market currently use a multi-channel ADC chip to form an 8-channel acquisition system, realize a microphone array composed of 8 microphones, realize 8-microphone noise reduction, support long-distance sound pickup (not less than 10 meters), support voice recognition and text conversion and other functions.

[0046] However, based on the intelligent recording function, some professional users also have the need for recording in professional scenes, for example, when recording with a wide dynamic range, they have the requirement for the reliability of the far-field recording signal and the near-field recording signal. That is, during the recording process, the far-field recording signal with a relatively low sound and the near-field recording signal with a relatively high sound must ensure the recording quality of the far-field recording signal and the near-field recording signal. However, existing recording equipment cannot meet the recording quality requirements for wide dynamic range recording in professional scenes.

[0047] Based on this, the present application proposes a recording device. This technical solution can select the data corresponding to the target gain channel according to the signal strength of the digital signal after analog-to-digital conversion of the audio signal with different gain values, thereby realizing the selection of appropriate gain for audio signals of different intensities, thereby improving the recording quality during wide dynamic range recording, thereby solving the problem that the prior art cannot meet the recording quality requirements for wide dynamic range recording.

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] Exemplary Devices

[0050] See also Figure 1 As shown, the embodiment of the present application provides a recording device. The recording device includes: a controller 101, a first microphone module 103 and a first recording acquisition module 102, wherein the first recording acquisition module 102 includes at least two gain channels 1021 with different gain values ​​(such as Figure 1 In this embodiment, the first microphone module 103 is connected to each gain channel 1021 in the first recording acquisition module 102, and the first recording acquisition module 102 is connected to the controller 101.

[0051] Specifically, the first microphone module 103 is used to collect external audio signals, and transmit the collected audio signals to each gain channel 1021 in the first recording acquisition module 102, respectively. Each gain channel 1021 in the first recording acquisition module 102 performs analog gain on the audio signal according to the corresponding gain value, so that each gain channel 1021 outputs an analog gain signal after the audio signal is gained by different gain values. Then, the first recording acquisition module 102 performs analog-to-digital conversion on the analog gain signals output by each gain channel 1021, that is, converts the analog gain signals into digital signals, thereby obtaining digital signals corresponding to the analog gain signals output by each gain channel 1021, that is, digital signals corresponding to each gain channel 1021. The first recording acquisition module 102 transmits the digital signals corresponding to each gain channel 1021 to the controller 101, and the controller 101 selects the target gain channel corresponding to the audio signal from all gain channels 1021 according to the signal strength of the digital signals corresponding to each gain channel 1021, and uses the digital signals corresponding to the target gain channels as the recording signals corresponding to the audio signal, and stores the recording signals. Among them, the controller 101 preferably selects the target gain channel corresponding to the audio signal from all gain channels 1021 according to the signal strength of the digital signal corresponding to the gain channel 1021 with the largest gain value, that is, if the digital signal corresponding to the gain channel 1021 with the largest gain value is larger, then the gain channel 1021 with a smaller gain value is selected as the target gain channel; if the digital signal corresponding to the gain channel 1021 with the largest gain value is smaller, then the gain channel 1021 with a larger gain value is selected as the target gain channel.

[0052] Furthermore, the first recording acquisition module 102 also includes an analog-to-digital conversion component 1022, and each gain channel 1021 is connected to the analog-to-digital conversion component 1022, and the analog-to-digital conversion component 1022 is connected to the first TDM interface in the controller 101. After each gain channel 1021 performs analog gain on the audio signal transmitted by the first microphone module 103 according to its own gain value, the analog gain signal is transmitted to the analog-to-digital conversion component 1022, and the analog-to-digital conversion component 1022 performs analog-to-digital conversion on the analog gain signal transmitted by each gain channel 1021, thereby obtaining a digital signal corresponding to each gain channel 1021, and transmits the digital signal corresponding to each gain channel 1021 to the controller 101 through the first TDM interface in the controller 101.

[0053] Furthermore, in this embodiment, the gain value of each gain channel 1021 is preferably set within the range of 0dB to 30dB. The first recording acquisition module 102 of this embodiment preferably sets two gain channels 1021 with different gain values, and the gain value difference between the two gain channels 1021 is preferably greater than 20dB. For example, the gain value of the first gain channel PGA1 is preferably set to 0dB, and the gain value of the second gain channel PGA2 is preferably set to 30dB.

[0054] Furthermore, in this embodiment, the external audio signal collected by the first microphone module 103 includes a plurality of audio frames, and the plurality of audio frames are transmitted to the respective gain channels 1021 in the first recording acquisition module 102, and each gain channel 1021 performs analog gain on the plurality of audio frames according to the respective corresponding gain values, and each gain channel 1021 outputs an analog gain signal corresponding to each audio frame. The analog-to-digital conversion component 1022 in the first microphone module 103 performs analog-to-digital conversion on the analog gain signal corresponding to each audio frame output by each gain channel 1021, thereby obtaining a digital signal of each audio frame corresponding to each gain channel 1021, for example, a digital signal of each audio frame corresponding to the first gain channel PGA1 and a digital signal of each audio frame corresponding to the second gain channel PGA2. The controller 101 determines the target gain channel corresponding to each audio frame according to the signal strength of the digital signal corresponding to each audio frame in different gain channels. For example, the first audio frame is input into each gain channel 1021 for analog gain, and each gain channel 1021 outputs the analog gain signal after the analog gain of the first audio frame. The analog-to-digital conversion component 1022 performs analog-to-digital conversion on the analog gain signal corresponding to the first audio frame output by each gain channel 1021, thereby obtaining the digital signal of the first audio frame corresponding to each gain channel 1021. Then, the controller 101 determines the target gain channel corresponding to the first audio frame according to the signal strength of the digital signal of the first audio frame corresponding to each gain channel 1021, and uses the digital signal of the first audio frame corresponding to the target gain channel as the recording signal corresponding to the first audio frame. The recording signals corresponding to each audio frame in the audio signal are determined in accordance with the method of determining the recording signal corresponding to the first audio frame. Finally, the controller 101 splices and merges the recording signals corresponding to each audio frame according to the recording time of each audio frame in the audio signal, thereby obtaining a complete recording signal corresponding to the audio signal, and stores the complete recording signal.

[0055] From the above introduction, it can be seen that in the recording device proposed in the embodiment of the present application, the first microphone module collects audio signals, and transmits the audio signals to each gain channel in the first recording acquisition module for analog gain; the first recording acquisition module performs analog-to-digital conversion on the analog gain signals output by each gain channel to obtain digital signals corresponding to each gain channel, and transmits the digital signals corresponding to each gain channel to the controller; the controller determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signals corresponding to each gain channel, uses the digital signals corresponding to the target gain channel as the recording signals corresponding to the audio signal, and stores the recording signals. By adopting the technical solution of this embodiment, the data corresponding to the target gain channel can be selected according to the signal strength of the digital signal after analog-to-digital conversion of the audio signal with different gain values, so that the appropriate gain can be selected for audio signals of different strengths, that is, a gain channel with a larger gain is selected for a far-field recording signal with a smaller sound, and a gain channel with a smaller gain is selected for a near-field recording signal with a larger sound, so as to avoid using the same gain channel. When the gain of the gain channel is small, the gain effect of the far-field recording signal with a smaller sound is not obvious, and the accuracy of the digital signal after analog-to-digital conversion is not high. When the gain of the gain channel is large, the recording signal with a larger sound is subjected to a large gain and then subjected to analog-to-digital conversion, saturation distortion occurs. Therefore, this embodiment can improve the recording quality when recording in a wide dynamic range.

[0056] As an optional implementation, another embodiment of the present application discloses that after the controller 101 determines the target gain channel corresponding to the audio signal based on the signal strength of the digital signals corresponding to each gain channel 1021, the digital signal corresponding to the target gain channel can be directly used as the recording signal corresponding to the audio signal, and the digital signal corresponding to the target gain channel can be digitally gained according to the difference between the gain value of the target gain channel and the maximum gain value to obtain a digital gain signal, and the digital gain signal can be used as the recording signal corresponding to the audio signal.

[0057] Specifically, this embodiment takes the maximum value of the gain values ​​of all gain channels in the first recording acquisition module as the maximum gain value. After the target gain channel corresponding to the audio signal is determined, the analog gain signal corresponding to the audio signal output by the target gain channel is converted into a digital signal, and the digital signal obtained by analog-to-digital conversion is digitally gained according to the difference between the gain value of the target gain channel and the maximum gain value, thereby obtaining a digital gain signal corresponding to the audio signal, and the digital gain signal is used as the recording signal corresponding to the audio signal.

[0058] In this embodiment, the audio signal includes several audio frames. For any audio frame, after determining the target gain channel corresponding to the audio frame, the analog gain signal corresponding to the audio frame output by the target gain channel is converted into a digital signal, and digital gain is performed according to the difference between the gain value of the target gain channel and the maximum gain value, thereby obtaining the digital gain signal corresponding to the audio frame, and the digital gain signal is used as the recording signal corresponding to the audio frame. For example, if the gain value of the first gain channel PGA1 contained in the first recording acquisition module is 0dB, and the gain value of the second gain channel PGA2 is 30dB, then the maximum gain value at this time is 30dB. If it is determined that the target gain channel corresponding to the audio frame is the first gain channel PGA1, then it is necessary to convert the analog gain signal corresponding to the audio frame output by the first gain channel PGA1 into a digital signal, and digital gain is performed according to the difference between 0dB and 30dB (i.e., 30dB), thereby obtaining the digital gain signal corresponding to the audio frame. If it is determined that the target gain channel corresponding to the audio frame is the second gain channel PGA2, then at this time, the analog gain signal corresponding to the audio frame output by the second gain channel PGA2 needs to be converted into a digital signal and the digital signal obtained is digitally gained according to the difference between 30dB and 30dB (i.e., 0dB), so as to obtain the digital gain signal corresponding to the audio frame, that is, no digital gain is performed, and the digital signal is directly used as a digital gain signal. Among them, the digital signal can be digitally gained according to the difference between the gain value of the target gain channel and the maximum gain value, and the signal strength of the digital signal can be directly increased by the difference. For example, when the difference is 30dB, the signal strength of the digital signal can be directly increased by 30dB. It can also be increased according to actual needs without exceeding the value of the difference. For example, when the difference is 30dB, the signal strength of the digital signal can also be increased to a value greater than 0dB and less than 30dB (such as 20dB, etc.).

[0059] In this embodiment, the target gain channel corresponding to the audio frame is determined according to the signal strength of the digital signal of the audio frame corresponding to each gain channel, and the target gain channel corresponding to the audio frame is preferably determined according to the signal strength of the digital signal of the audio frame corresponding to the gain channel with the largest gain value, that is, if the digital signal obtained by analog-to-digital conversion after the audio frame is subjected to analog gain through the gain channel with the largest gain value is small, the gain channel with the larger gain value is selected as the target gain channel corresponding to the audio frame, and if the digital signal obtained by analog-to-digital conversion after the audio frame is subjected to analog gain through the gain channel with the largest gain value is large, the gain channel with the smaller gain value is selected as the target gain channel corresponding to the audio frame. In this way, it is possible to avoid the situation where analog-to-digital conversion saturation distortion occurs when analog-to-digital conversion is performed after the audio frame with a larger sound intensity is subjected to a larger gain through the gain channel with a larger gain value, thereby improving the recording quality.

[0060] However, since the target gain channels corresponding to different audio frames may be different, the gain values ​​of analog gain for different audio frames are also different, resulting in the direct splicing and merging of digital signals after analog-to-digital conversion of analog gain signals of different audio frames. There may be certain differences between the digital signals corresponding to different audio frames, resulting in incoherent recording signals after splicing and merging, affecting the recording quality. In this embodiment, the analog gain signal of the audio frame output by the gain channel whose gain value is less than the maximum gain value is converted into a digital signal, and then the digital signal is digitally gained according to the difference between the gain value of the gain channel and the maximum gain channel, so that the audio frame with a smaller signal strength of the digital signal uses the gain channel with a larger gain value for analog gain, and the audio frame with a larger signal strength of the digital signal uses the gain channel with a smaller gain value for analog gain, thereby avoiding the situation where the audio frame with a larger signal strength uses the gain channel with a larger gain value for analog gain and then performs analog-to-digital conversion and saturation distortion of the analog-to-digital conversion occurs; the analog gain signal of the audio frame whose analog gain is performed using the gain channel with a smaller gain value is converted into a digital signal according to the difference between the gain value of the analog gain and the maximum gain value, and the audio frame with a smaller gain value of the target gain channel is gain compensated, thereby reducing the gain difference between different audio frames, and then reducing the difference between the recording signals corresponding to different audio frames, improving the coherence of the complete recording signal after the recording signals corresponding to each audio frame are spliced ​​and merged, and further ensuring the recording quality.

[0061] As an optional implementation, another embodiment of the present application discloses that the first recording acquisition module 102 includes a first gain channel PGA1 and a second gain channel PAG2, wherein the gain value of the first gain channel PGA1 is less than the gain value of the second gain channel PGA2, and the difference between the gain value of the first gain channel PGA1 and the gain value of the second gain channel PGA2 is preferably greater than 20dB. For example, the gain value of the first gain channel PGA1 can be set to 0dB, and the gain value of the second gain channel PGA2 can be set to 30dB.

[0062] Specifically, the controller 101 determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, preferably according to the signal strength of the digital signal corresponding to the gain channel with the largest gain value (i.e., the second gain channel PGA2), and determines the target gain channel corresponding to the audio signal. If the signal strength of the digital signal corresponding to the gain channel with the largest gain value (i.e., the second gain channel PGA2) is lower than the preset signal strength, the target gain channel corresponding to the audio signal is determined to be the second gain channel PGA2; if the signal strength of the digital signal corresponding to the gain channel with the largest gain value (i.e., the second gain channel PGA2) is not lower than the preset signal strength, the target gain channel corresponding to the audio signal is determined to be the first gain channel PGA1. In this embodiment, the preset signal strength is preferably set to -6dBFS. In this embodiment, the target gain channel with a smaller gain value can be selected for audio frames with a larger signal strength, and the target gain channel with a larger gain value can be selected for audio frames with a smaller signal strength, thereby avoiding the situation where the audio frame gain is inappropriate and the data is scrapped.

[0063] In a specific embodiment, an audio frame in an audio signal is input to the first gain channel PGA1 and the second gain channel PAG2 respectively, the first gain channel PGA1 performs a gain of 0 dB on the audio frame and outputs a first analog gain signal corresponding to the audio frame, and the second gain channel PAG2 performs a gain of 30 dB on the audio frame and outputs a second analog gain signal corresponding to the audio frame. The analog-to-digital conversion component 1022 in the first recording acquisition module 102 performs analog-to-digital conversion on the first analog gain signal and the second analog gain signal respectively to obtain a first digital signal corresponding to the audio frame and a second digital signal corresponding to the audio frame. The controller 101 determines whether the signal strength of the digital signal corresponding to the gain channel with the largest gain value (i.e., the second gain channel PGA2) (i.e., the signal strength of the second digital signal) is lower than the preset signal strength. If the signal strength of the second digital signal is lower than the preset signal strength, it is determined that the target gain channel corresponding to the audio frame is the second gain channel PGA2, and the digital signal corresponding to the target gain channel (i.e., the second gain channel PGA2) is digitally gained according to the difference (i.e., 0 dB) between the gain value of the second gain channel PGA2 (i.e., 30 dB) and the maximum gain value (i.e., 30 dB) (i.e., the digital signal corresponding to the second gain channel PGA2 is gained by 0 dB, that is, the second gain channel PGA2 is not The digital signal corresponding to the audio frame is digitally gained (the digital signal corresponding to the first gain channel PGA2 is digitally gained) to obtain the digital gain signal corresponding to the audio frame; if the signal strength of the second digital signal is not lower than the preset signal strength, the target gain channel corresponding to the audio frame is determined to be the first gain channel PGA1, and the digital signal corresponding to the target gain channel (i.e., the first gain channel PGA1) is digitally gained according to the difference (i.e., 30dB) between the gain value of the first gain channel PGA1 (i.e., 0dB) and the maximum gain value (i.e., 30dB) (i.e., the digital signal corresponding to the first gain channel PGA1 is gained by 30dB) to obtain the digital gain signal corresponding to the audio frame; finally, the digital gain signal corresponding to the audio frame is used as the recording signal corresponding to the audio frame. The recording signals corresponding to each audio frame in the audio signal are determined through the above steps, and the recording signals corresponding to each audio frame are spliced ​​and merged according to the recording time corresponding to each audio frame to obtain a complete recording signal corresponding to the audio signal.

[0064] As an optional implementation, see Figure 2 As shown, in another embodiment of the present application, the first microphone module 103 includes two microphones, such as Figure 2 The first microphone 1031 and the second microphone 1032 in the first recording acquisition module 102 include a first gain channel corresponding to each microphone and a second gain channel corresponding to each microphone, such as Figure 2As shown, the first gain channel corresponding to the first microphone 1031 is PGA1, the second gain channel corresponding to the first microphone 1031 is PGA2, the first gain channel corresponding to the second microphone 1032 is PGA3, and the second gain channel corresponding to the second microphone 1032 is PGA4. The gain value of the first gain channel PGA1 corresponding to the first microphone 1031 is the same as the gain value of the first gain channel PGA3 corresponding to the second microphone 1032, and the gain value of the second gain channel PGA2 corresponding to the first microphone 1031 is the same as the gain value of the second gain channel PGA4 corresponding to the second microphone 1032. The audio signal collected by the first microphone 1031 is transmitted to the first gain channel PGA1 corresponding to the first microphone 1031 and the second gain channel PGA2 corresponding to the first microphone 1031 for analog gain, respectively, and the audio signal collected by the second microphone 1032 is transmitted to the first gain channel PGA3 corresponding to the second microphone 1032 and the second gain channel PGA4 corresponding to the second microphone 1032 for analog gain, respectively. In this embodiment, the audio signal collected by the first microphone 1031 and the audio signal collected by the second microphone 1032 are processed using the audio signal processing method in the above embodiment, and finally a recording signal corresponding to the audio signal collected by the first microphone 1031 and a recording signal corresponding to the audio signal collected by the second microphone 1032 are obtained and stored.

[0065] As an optional implementation, see Figure 3 As shown, in another embodiment of the present application, it is disclosed that the recording device further includes: a second microphone module 105, an analog switch module 104 and a second recording acquisition module 106. The first microphone module 103 is connected to the first recording acquisition module 102 and the second recording acquisition module 106 respectively through the analog switch module, the second microphone module 105 is connected to the second recording acquisition module 106, the second recording acquisition module 106 and the analog switch module 104 are connected to the controller 101 respectively, specifically, the second recording acquisition module 106 is connected to the second TDM interface in the controller 101, and the analog switch module 104 is connected to the IO interface in the controller 101.

[0066] Specifically, the controller 101 controls the connection and disconnection between the analog switch module 104 and the first recording acquisition module 102, and the connection and disconnection between the analog switch module 104 and the second recording acquisition module 106 according to the user's recording selection. For example, in this embodiment, the user's recording selection includes omnidirectional scene recording and professional scene recording (i.e., directional scene recording). When the user's recording selection is omnidirectional scene recording, the controller 101 controls the connection between the analog switch module 104 and the first recording acquisition module 102 to be disconnected, and controls the connection between the analog switch module 104 and the second recording acquisition module 106 to be connected; when the user's recording selection is professional scene recording, the controller 101 controls the connection between the analog switch module 104 and the first recording acquisition module 102 to be connected, and controls the connection between the analog switch module 104 and the second recording acquisition module 106 to be disconnected. In this embodiment, the controller 101 can control the on / off between the analog switch module 104 and the first recording acquisition module 102 and the on / off between the analog switch module 104 and the second recording acquisition module 106 through the GPIO high and low levels (0 or 1). When the controller 101 outputs a GPIO high level (i.e., 1), the connection between the analog switch module 104 and the first recording acquisition module 102 is controlled to be connected, and the connection between the analog switch module 104 and the second recording acquisition module 106 is controlled to be disconnected, thereby realizing professional scene recording; when the controller 101 outputs a GPIO low level (i.e., 0), the connection between the analog switch module 104 and the first recording acquisition module 102 is controlled to be disconnected, and the connection between the analog switch module 104 and the second recording acquisition module 106 is controlled to be connected, thereby realizing omnidirectional scene recording.

[0067] When the connection between the analog switch module 104 and the first recording acquisition module 102 is turned on, the first microphone module 103 transmits the audio signal collected by it to the first recording acquisition module 102 through the analog switch module 104, that is, the audio signal collected by the first microphone module 103 is respectively transmitted to each gain channel 1021 in the first recording acquisition module 102 through the analog switch module. When the connection between the analog switch module 104 and the second recording acquisition module 106 is turned on, the first microphone module 103 transmits the audio signal collected by it to the second recording acquisition module 106 through the analog switch module 104. The second microphone module 105 transmits the audio signal collected by it to the second recording acquisition module 106. The second recording acquisition module 106 can perform analog-to-digital conversion on all the audio signals it receives, and transmit the digital signals after analog-to-digital conversion to the controller 101, so that the controller 101 determines the recording signal according to all the digital signals. For example, the controller 101 stores all the received digital signals as the final recording signal.

[0068] In this embodiment, the first microphone module 103 is a microphone module set according to the direction of the sound source to be collected, that is, a directional microphone module, and the microphones in the first microphone module 103 all point in the direction of the sound source to be collected; the second microphone module 105 is an omnidirectional microphone module, that is, the microphones in the second microphone module 105 are set in an omnidirectional array and can collect sounds from all directions.

[0069] This embodiment can realize the switching between omnidirectional scene recording and professional scene recording by setting the analog switch module 104. It can realize both omnidirectional recording and professional recording with a wide dynamic range in a specified direction. Users can independently choose the recording method according to their needs, thereby improving the convenience of recording and the wide application of the recording equipment.

[0070] As an optional implementation, see Figure 4 As shown, in another embodiment of the present application, it is disclosed that the number of audio switches included in the analog switch module 104 is the same as the number of microphones included in the first microphone module 103, and they correspond one to one. The first microphone module 103 includes a first microphone 1031 and a second microphone 1032, and the analog switch module 104 includes a first audio switch 1041 and a second audio switch 1042. The first microphone 1031 is connected to the first recording acquisition module 102 and the second recording acquisition module 106 respectively through the first audio switch 1041, and the second microphone 1032 is connected to the first recording acquisition module 102 and the second recording acquisition module 106 respectively through the second audio switch 1042. Specifically, the first audio switch 1041 is respectively connected to the gain channels corresponding to the first microphone 1031 in the first recording acquisition module 102, that is, the first audio switch 1041 is respectively connected to the first gain channel PGA1 corresponding to the first microphone 1031 in the first recording acquisition module and the second gain channel PGA2 corresponding to the first microphone 1031; the second audio switch 1042 is respectively connected to the gain channels corresponding to the second microphone 1032 in the first recording acquisition module 102, that is, the second audio switch 1042 is respectively connected to the first gain channel PGA3 corresponding to the second microphone 1032 in the first recording acquisition module and the second gain channel PGA4 corresponding to the second microphone 1032.

[0071] As an optional implementation, see Figure 4As shown, in another embodiment of the present application, the second microphone module 105 includes: a first microphone group 1051 and a second microphone group 1052, and the second recording acquisition module 106 includes: a first audio analog-to-digital converter 1061 and a second audio analog-to-digital converter 1062. The first audio switch 1041 and the first microphone group 1051 are respectively connected to the first audio analog-to-digital converter 1061, the second audio switch 1042, the second microphone group 1052 and the first audio analog-to-digital converter 1061 are respectively connected to the second audio analog-to-digital converter 1062, and the second audio analog-to-digital converter 1062 is connected to the controller 101, that is, the second audio analog-to-digital converter 1062 is connected to the second TDM interface in the controller 101. When the connection between the first audio switch 1041 and the first audio analog-to-digital converter 1061 is turned on, and the connection between the second audio switch 1042 and the second audio analog-to-digital converter 1062 is turned on, the first microphone 1031 transmits the audio signal collected by it to the first audio analog-to-digital converter 1061 through the first audio switch 1041, and the audio signal collected by the first microphone group 1051 is also transmitted to the first audio analog-to-digital converter 1061, the first audio analog-to-digital converter 1061 performs analog-to-digital conversion on the received audio signal, and transmits the digital signal after the analog-to-digital conversion to the second audio analog-to-digital converter 1062; the second microphone 1032 transmits the audio signal collected by it to the second audio analog-to-digital converter 1062 through the second audio switch 1042, and the audio signal collected by the second microphone group 1052 is also transmitted to the second audio analog-to-digital converter 1062, the second audio analog-to-digital converter 1062 performs analog-to-digital conversion on the received audio signal, and transmits the digital signal after the analog-to-digital conversion and the digital signal transmitted by the first audio analog-to-digital converter 1061 to the controller 101.

[0072] In this embodiment, the first microphone group 1051 and the second microphone group 1052 each include three microphones, the first audio analog-to-digital converter 1061 and the second audio analog-to-digital converter 1062 are both configured as 4-channel audio analog-to-digital converters, the three microphones in the first microphone group 1051 and the first microphone 1031 connected to the first audio switch 1041 are respectively connected to one channel in the first audio analog-to-digital converter 1061, and the three microphones in the second microphone group 1052 and the second microphone 1032 connected to the second audio switch 1042 are respectively connected to one channel in the second audio analog-to-digital converter 1062. When the connection between the first audio switch 1041 and the first audio analog-to-digital converter 1061 is turned on, and the connection between the second audio switch 1042 and the second audio analog-to-digital converter 1062 is turned on, there are eight microphones providing the second recording acquisition module 106 with collected audio signals, thereby achieving 8-microphone omnidirectional recording.

[0073] In this embodiment, the connection channel between the first audio switch 1041 and the gain channel in the first recording acquisition module 102 is used as the A1 channel, the connection channel between the first audio switch 1041 and the first audio analog-to-digital converter 1061 in the second recording acquisition module 106 is used as the B1 channel, the connection channel between the second audio switch 1042 and the gain channel in the first recording acquisition module 102 is used as the A2 channel, and the connection channel between the second audio switch 1042 and the second audio analog-to-digital converter 1062 in the second recording acquisition module 106 is used as the B2 channel. When the user's recording selection is omnidirectional scene recording, the controller 101 controls the B1 channel and the B2 channel to be turned on, and the A1 channel and the A2 channel to be turned off; when the user's recording selection is professional scene recording, the controller 101 controls the B1 channel and the B2 channel to be turned off, and the A1 channel and the A2 channel to be turned on. In this embodiment, the controller 101 can control the on and off of the A1 channel, A2 channel, B1 channel and B2 channel through the GPIO high and low levels (0 or 1). When the controller 101 outputs a GPIO high level (i.e., 1), the controller 101 controls the B1 channel and the B2 channel to be disconnected, and the A1 channel and the A2 channel to be turned on, thereby realizing professional scene recording; when the controller 101 outputs a GPIO low level (i.e., 0), the controller 101 controls the B1 channel and the B2 channel to be turned on, and the A1 channel and the A2 channel to be disconnected, thereby realizing omnidirectional scene recording.

[0074] In the present embodiment, all the microphones in the first microphone module 103 and the second microphone module 105 are used in omnidirectional scene recording, and the microphones in the first microphone module 103 are used in professional scene recording. The two recording scenes share the microphones in the first microphone module 103, which can save the usage space of the recording equipment and realize the product convenience of the recording equipment.

[0075] Further, in this embodiment, the first recording acquisition module 102, the first audio analog-to-digital converter 1061 and the second audio analog-to-digital converter 1062 preferably adopt 4-channel audio analog-to-digital converters, wherein the first recording acquisition module 102 preferably adopts the AK5704 model, and the first audio analog-to-digital converter 1061 and the second audio analog-to-digital converter 1062 preferably adopt the ES7210 model. The first audio switch 1041 and the second audio switch 1042 preferably adopt the SGM3718 model. The microphone in the first microphone module 103 preferably adopts the BUM1045L20P model, and the microphone in the second microphone module 105 preferably adopts the ML-3526 model. Through the model settings of the above-mentioned modules, the 48K sampling rate of 8-microphone recording can be supported when recording in omnidirectional scenes, and the 192K sampling rate of professional scene recording can be supported when recording in professional scenes.

[0076] Exemplary Methods

[0077] Accordingly, the present application also provides a recording method, which is applied to the recording device described in any of the above embodiments. Figure 5 As shown, the method includes:

[0078] S101. The first microphone module collects audio signals, and transmits the audio signals to each gain channel in the first recording collection module for analog gain.

[0079] S102, the first recording acquisition module performs analog-to-digital conversion on the analog gain signals output by each gain channel to obtain digital signals corresponding to each gain channel, and transmits the digital signals corresponding to each gain channel to the controller.

[0080] S103: The controller determines a target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, uses the digital signal corresponding to the target gain channel as a recording signal corresponding to the audio signal, and stores the recording signal.

[0081] From the above introduction, it can be seen that the recording method proposed in the embodiment of the present application can select the data corresponding to the target gain channel according to the signal strength of the digital signal after analog-to-digital conversion of the audio signal with different gain values, so as to select the appropriate gain for audio signals of different strengths, that is, for far-field recording signals with smaller sounds, a gain channel with larger gain is selected, and for near-field recording signals with larger sounds, a gain channel with smaller gain is selected, so as to avoid using the same gain channel. When the gain channel gain is small, the gain effect of the far-field recording signal with smaller sounds is not obvious, and the accuracy of the digital signal after analog-to-digital conversion is not high. When the gain channel gain is large, the recording signal with larger sounds is subjected to a large gain and then subjected to analog-to-digital conversion, which may cause saturation distortion. Therefore, the present embodiment can improve the recording quality during wide dynamic range recording.

[0082] As an optional implementation, another embodiment of the present application discloses that in step S103, using the digital signal corresponding to the target gain channel as the recording signal corresponding to the audio signal includes:

[0083] According to the difference between the gain value of the target gain channel and the maximum gain value, digital gain is performed on the digital signal corresponding to the target gain channel to obtain a digital gain signal;

[0084] Using the digital gain signal as a recording signal corresponding to the audio signal;

[0085] The maximum gain value is the maximum value among the gain values ​​of all gain channels in the first recording acquisition module.

[0086] As an optional implementation, another embodiment of the present application discloses that the first recording acquisition module includes: a first gain channel and a second gain channel, and the gain value of the first gain channel is smaller than the gain value of the second gain channel.

[0087] In step S103, the controller determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, including:

[0088] If the signal strength of the digital signal corresponding to the second gain channel is lower than the preset signal strength, determining that the target gain channel corresponding to the audio signal is the second gain channel;

[0089] If the signal strength of the digital signal corresponding to the second gain channel is not lower than the preset signal strength, it is determined that the target gain channel corresponding to the audio signal is the first gain channel.

[0090] As an optional implementation, another embodiment of the present application discloses that the first microphone module includes two microphones; the first recording acquisition module includes a first gain channel corresponding to each microphone and a second gain channel corresponding to each microphone.

[0091] As an optional implementation, another embodiment of the present application discloses that the recording device further includes a second microphone module, an analog switch module, and a second recording acquisition module. The recording method further includes the following steps:

[0092] The controller controls the connection and disconnection between the analog switch module and the first recording acquisition module and between the analog switch module and the second recording acquisition module according to the recording selection of the user;

[0093] When the first microphone module is connected between the analog switch module and the first recording acquisition module, the audio signal collected by the first microphone module is transmitted to the first recording acquisition module through the analog switch module; when the analog switch module is connected to the second recording acquisition module, the audio signal collected by the first microphone module is transmitted to the second recording acquisition module through the analog switch module;

[0094] The second microphone module transmits the audio signal collected by the second microphone module to the second recording collection module;

[0095] The second recording acquisition module performs analog-to-digital conversion on the received audio signal, and transmits the converted digital signal to the controller, so that the controller determines the recording signal according to the digital signal.

[0096] The recording method provided in this embodiment and the recording device provided in the above embodiment of this application belong to the same application concept. The recording device provided in the above embodiment can execute any recording method provided in this embodiment, and has the corresponding functional modules and beneficial effects of executing the recording method. For technical details not fully described in this embodiment, please refer to the specific content of the recording device provided in the above embodiment of this application, and will not be repeated here.

[0097] Exemplary computer program products and storage media

[0098] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the recording method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0099] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0100] In addition, an embodiment of the present application may also be a storage medium on which a computer program is stored, and the computer program is executed by a processor to execute the steps of the recording method according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0101] For the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0102] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0103] The steps in the methods of each embodiment of the present application can be adjusted in sequence, combined and deleted according to actual needs, and the technical features recorded in each embodiment can be replaced or combined.

[0104] The modules and sub-modules in the devices and terminals of the various embodiments of the present application can be combined, divided and deleted according to actual needs.

[0105] In the several embodiments provided in the present application, it should be understood that the disclosed terminals, devices and methods can be implemented in other ways. For example, the terminal embodiments described above are only schematic, for example, the division of modules or submodules is only a logical function division, and there may be other division methods in actual implementation, for example, multiple submodules or modules can be combined or integrated into another module, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0106] The modules or submodules described as separate components may or may not be physically separated, and the components of the modules or submodules may or may not be physical modules or submodules, that is, they may be located in one place, or they may be distributed on multiple network modules or submodules. Some or all of the modules or submodules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0107] In addition, each functional module or submodule in each embodiment of the present application may be integrated into one processing module, or each module or submodule may exist physically separately, or two or more modules or submodules may be integrated into one module. The above-mentioned integrated modules or submodules may be implemented in the form of hardware or in the form of software functional modules or submodules.

[0108] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0109] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly by hardware, software units executed by a processor, or a combination of the two. The software units may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0110] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0111] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A recording device, characterized in that: include: A controller, a first microphone module and a first recording acquisition module; The first recording acquisition module includes at least two gain channels with different gain values; The first microphone module is used to collect audio signals, and transmit the audio signals to the respective gain channels in the first recording collection module for analog gain; The first recording acquisition module is used to perform analog-to-digital conversion on the analog gain signals output by each of the gain channels to obtain digital signals corresponding to each of the gain channels, and transmit the digital signals corresponding to each of the gain channels to the controller; The controller is used to determine the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, use the digital signal corresponding to the target gain channel as the recording signal corresponding to the audio signal, and store the recording signal.

2. The recording device according to claim 1, characterized in that The controller uses the digital signal corresponding to the target gain channel as the recording signal corresponding to the audio signal, including: According to the difference between the gain value of the target gain channel and the maximum gain value, digital gain is performed on the digital signal corresponding to the target gain channel to obtain a digital gain signal; Using the digital gain signal as a recording signal corresponding to the audio signal; The maximum gain value is the maximum value among the gain values ​​of all gain channels in the first recording acquisition module.

3. The recording device according to claim 1, characterized in that: The first recording acquisition module includes: a first gain channel and a second gain channel, wherein the gain value of the first gain channel is smaller than the gain value of the second gain channel; The controller determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, including: If the signal strength of the digital signal corresponding to the second gain channel is lower than the preset signal strength, determining that the target gain channel corresponding to the audio signal is the second gain channel; If the signal strength of the digital signal corresponding to the second gain channel is not lower than the preset signal strength, it is determined that the target gain channel corresponding to the audio signal is the first gain channel.

4. The recording device according to claim 1, characterized in that: The first microphone module includes two microphones; the first recording acquisition module includes a first gain channel corresponding to each microphone and a second gain channel corresponding to each microphone.

5. The recording device according to claim 1, characterized in that: Also includes: A second microphone module, an analog switch module, and a second recording acquisition module; The controller is connected to the analog switch module, and is used to control the connection and disconnection between the analog switch module and the first recording acquisition module, and the connection and disconnection between the analog switch module and the second recording acquisition module according to the user's recording selection; The first microphone module is connected to the first recording acquisition module and the second recording acquisition module respectively through the analog switch module, and is used for transmitting the audio signal collected by the first microphone module to the first recording acquisition module through the analog switch module when the analog switch module is connected to the first recording acquisition module, and transmitting the audio signal collected by the first microphone module to the second recording acquisition module through the analog switch module when the analog switch module is connected to the second recording acquisition module; The second microphone module is connected to the second recording acquisition module and is used to transmit the audio signal collected by the second microphone module to the second recording acquisition module; The second recording acquisition module is connected to the controller and is used for performing analog-to-digital conversion on the received audio signal and transmitting the converted digital signal to the controller so that the controller determines the recording signal according to the digital signal.

6. The recording device according to claim 5, characterized in that: The first microphone module includes a first microphone and a second microphone, and the analog switch module includes a first audio switch and a second audio switch; The first microphone is connected to the first recording acquisition module and the second recording acquisition module respectively through the first audio switch; The second microphone is connected to the first recording acquisition module and the second recording acquisition module respectively through the second audio switch.

7. The recording device according to claim 6, characterized in that The second microphone module includes a first microphone group and a second microphone group, and the second recording acquisition module includes: a first audio analog-to-digital converter and a second audio analog-to-digital converter; The first audio switch and the first microphone group are respectively connected to the first audio analog-to-digital converter; The second audio switch, the second microphone group and the first audio analog-to-digital converter are respectively connected to the second audio analog-to-digital converter; The second audio analog-to-digital converter is connected to the controller.

8. The recording device according to claim 5, characterized in that The first microphone module is a microphone module set according to the direction of the sound source to be collected, and the second microphone module is an omnidirectional microphone module.

9. A recording method, characterized in that: Applied to the recording device according to any one of claims 1 to 8, the recording method comprises: The first microphone module collects audio signals, and transmits the audio signals to the respective gain channels in the first recording acquisition module for analog gain; The first recording acquisition module performs analog-to-digital conversion on the analog gain signals output by each of the gain channels to obtain digital signals corresponding to each of the gain channels, and transmits the digital signals corresponding to each of the gain channels to the controller; The controller determines the target gain channel corresponding to the audio signal according to the signal strength of the digital signal corresponding to each gain channel, uses the digital signal corresponding to the target gain channel as the recording signal corresponding to the audio signal, and stores the recording signal.

10. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, the recording method as claimed in claim 9 is implemented.

11. A computer program product, characterized in that It comprises computer program instructions, which, when executed by a processor, enable the processor to implement the recording method as claimed in claim 9.

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